Stackable chair



FIG. 1 is a front perspective of a stackable chair, showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a perspective view of an alternative design, differing only in the rectangular configuration of the back rest. 

The ornamental design for a stackable chair, as shown and described. 